共查询到18条相似文献,搜索用时 78 毫秒
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分析学生对二氧化碳的3个典型学科认知障碍,以“二氧化碳的捕捉”为情境,通过“尝试捕捉二氧化碳”“谁在捕捉二氧化碳”“捕捉背后的原理”等3个主要环节,实现对学科认知障碍的突破,展示了一种新的中考复习教学思路。 相似文献
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基于Parsel理念,以二氧化碳为载体,正确定位教学目标,改变教学环节,转变教学策略,创设贴近生活的情境,重视评价反馈,引导学生在情境感知、问题解决和探究实践中有效提升科学素养。研究发现,基于Parsel理念的初中化学教学实践应关注3个方面:应创设贴近生活的情境吸引学生;以高质量的问题引发思考;以多样化的活动助推探究实践。 相似文献
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核心素养视域下的初中化学课堂教学需要有一个深入学科本质的教学模式。“四重四步”教学模式通过教师的“四步教学”和学生的基础性认知、本质性认知、结构性认知、价值性认知的“四重认知”实现了由基于知识点的教学到基于化学学科核心素养发展的教、学、评一体化的转变,达成学科育人的要求。 相似文献
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采用美国诺尔曼·莱德曼(Norman G. Lederman)和朱迪斯·莱德曼(Judith S. Lederman)编制的科学探究观(View About Scientific Inquiry, VASI)调查问卷,对38位职前化学教师的科学探究观进行了调查。结果发现,职前化学教师对科学探究的理解水平参差不齐,理解水平最好的是维度三(D3),74%的职前化学教师对该维度持“通晓的(Informed)”观点;理解水平中等的是维度二(D2),66%的职前化学教师对该维度持“混合的(Mixed)”观点;理解水平最差的是维度七(D7),61%的职前化学教师对该维度持“朴素的(Naive)”观点,并且没有人对该维度持“通晓的”观点,针对这种情况,提出3条改进策略:一是“显性化”,在课程标准和教科书中以“显性”的方式呈现有关科学探究理解的内容;二是“活动化”,教师在教学中设计并实施基于理解探究的各种实践活动;三是“反思性”,引导学生积极主动地反思科学探究活动,获取对科学探究的深入理解。 相似文献
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“洗涤的学问”是与学生日常生活和化学紧密相关的主题。开发了与初、高中化学课程标准紧密联系的学习任务,帮助学生更好地理解洗涤剂去污原理,建构“结构决定性质”观念,并拓展关于洗涤学问的视野,增强分析和处理身边事物的能力。 相似文献
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基于PCK的视角,采用问卷法调查30名职前化学教师对科学探究教学所持的认识,通过质性编码分析其认识组分,并利用量规评价组分的整合水平,结果表明其组分及整合为中低水平,即认识水平较低。据此对我国职前化学教师培养及教师教育研究提出建议。 相似文献
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以二氧化碳的发现史为主线,基于化学史、生活与教学融合的思想进行教学设计:从化学史提出问题,引导学生进行实验探究,在探究中建构知识,并将知识应用于生活实际,从而完成教学目标,达到提升学生科学素养的目的。 相似文献
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Dr. Murat Uygun Dr. Virendra V. Singh Kevin Kaufmann Dr. Deniz A. Uygun Severina D. S. de Oliveira Prof. Joseph Wang 《Angewandte Chemie (International ed. in English)》2015,54(44):12900-12904
We describe a mobile CO2 scrubbing platform that offers a greatly accelerated biomimetic sequestration based on a self‐propelled carbonic anhydrase (CA) functionalized micromotor. The CO2 hydration capability of CA is coupled with the rapid movement of catalytic micromotors, and along with the corresponding fluid dynamics, results in a highly efficient mobile CO2 scrubbing microsystem. The continuous movement of CA and enhanced mass transport of the CO2 substrate lead to significant improvements in the sequestration efficiency and speed over stationary immobilized or free CA platforms. This system is a promising approach to rapid and enhanced CO2 sequestration platforms for addressing growing concerns over the buildup of greenhouse gas. 相似文献
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The adsorption of CO2 on a raw activated carbon A and three modified activated carbon samples B, C, and D at temperatures ranging from 303 to 333 K and the thermodynamics of adsorption have been investigated using a vacuum adsorption apparatus in order to obtain more information about the effect of CO2 on removal of organic sulfur-containing compounds in industrial gases. The active ingredients impregnated in the carbon samples show significant influence on the adsorption for CO2 and its volumes adsorbed on modified carbon samples B, C, and D are all larger than that on the raw carbon sample A. On the other hand, the physical parameters such as surface area, pore volume, and micropore volume of carbon samples show no influence on the adsorbed amount of CO2. The Dubinin-Radushkevich (D-R) equation was the best model for fitting the adsorption data on carbon samples A and B, while the Preundlich equation was the best fit for the adsorption on carbon samples C and D. The isosteric heats of adsorption on carbon samples A, B, C, and D derived from the adsorption isotherms using the Clapeyron equation decreased slightly increasing surface loading. The heat of adsorption lay between 10.5 and 28.4 kJ/mol, with the carbon sample D having the highest value at all surface coverages that were studied. The observed entropy change associated with the adsorption for the carbon samples A, B, and C (above the surface coverage of 7 ml/g) was lower than the theoretical value for mobile adsorption. However, it was higher than the theoretical value for mobile adsorption but lower than the theoretical value for localized adsorption for carbon sample D. 相似文献
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二氧化碳(CO2)捕获以及转化是控制大气中二氧化碳含量和有效利用的主要策略。CO2 响应型聚合物以含有胺基的烯类单体为主要原料,通过接枝聚合或与其他功能分子复合来改善其对CO2的响应以及捕获性能。其中,天然高分子(如多糖、蛋白质等)具有资源丰富、无毒、可降解和良好的生物相容性等优点,是制备环境友好高分子材料的最佳选择。同时,壳聚糖含有大量的伯胺,在制备基于胺基的具有CO2响应以及捕获性能的智能复合材料中具有潜在优势。本文首先介绍了CO2响应聚合物和壳聚糖的特点,进一步归纳了近年来基于壳聚糖的CO2响应高分子以及捕获材料的最新研究进展,并对这类复合材料的设计及其应用前景进行了展望。 相似文献
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以学生的课堂质疑为背景,从温室效应和全球气候变暖的概念区别、全球气候变暖成因的证据、温室气体种类的界定3个层面,论述了由于具有历史局限性的证据和缺少对科学态度的真正理解,导致全球气候变暖问题出现了教学和认识上的误区。 相似文献
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Milad Abolhasani Prof. Axel Günther Prof. Eugenia Kumacheva 《Angewandte Chemie (International ed. in English)》2014,53(31):7992-8002
Carbon dioxide (CO2) sequestration, storage and recycling will greatly benefit from comprehensive studies of physical and chemical gas–liquid processes involving CO2. Over the past five years, microfluidics emerged as a valuable tool in CO2‐related research, due to superior mass and heat transfer, reduced axial dispersion, well‐defined gas–liquid interfacial areas and the ability to vary reagent concentrations in a high‐throughput manner. This Minireview highlights recent progress in microfluidic studies of CO2‐related processes, including dissolution of CO2 in physical solvents, CO2 reactions, the utilization of CO2 in materials science, and the use of supercritical CO2 as a “green” solvent. 相似文献
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通过对碳单质概念发展历程的考证可知,碳是古代已知的非金属元素。至17—18世纪,随着科学实验的兴起和元素观的发展,金刚石和石墨均被证明为碳的单质,碳单质概念初步形成;20世纪80年代C60的发现及之后碳纳米管、石墨烯和T-碳的发现使人们对碳单质概念有了新认识。在化学教育中,须让学生认识到碳单质概念的发展史是物质的发现史,也是科学思想的演进史和科学方法的发展史。 相似文献